Fifty -six soybeans collected from internal and external nations were planted on the low -potassium soil .Thedifferences of different soybean resistant to low -potassium were shown .According to the relations of resistance andyields , those soybeans were classified into 4 types :high -yield and sensitivity , high -yield and non -sensitivity , low -yield and sensitivity and low -yield and non -sensitivity .High -yield and non -sensitivity and low -yield and non -sensitivity had potassium high efficiency gene and could be as the basic materials for culture and breeding .